A really dry flatulence which upon exiting the anus emits dust which then can be seen on the inner lining of the undergarment as a powder like substance which falls away upon removal of said undergarment.
Hey Bill, check out my collection of fart dust I have here in this jar. It weighs almost 10 pounds!
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When you have to shit, but only a fart come's spraying out yo bootyhole.
I just had to run to the bathroom, only to fucking fart dust.